English art mid 19th century detailed watercolor of a castle with figures

Watercolor on paper painting of a classic stone castle with figures outside its portals, 14" by 10 1/2" (26 1/2" by 23" as framed), apparently unsigned. This is a circa 1850 work which has survived in presentable condition. There is foxing in the sky principally, as shown, but no large stains. To be sure, there were a lot of anonymous skilled watercolor artists in the British Isles in the 19th century, though this might well have been created by an artist that would be "listed" today.